Mary was NOT the daughter of Charles L Cobb and Ann Walton. The reason this has been proven is that Charles L. Cobb and Ann Walton were NEVER in South Carolina.. I have attached a link to the Find A Grave page for Mary Cobbs, daughter of Charles L Cobbs and Ann Walton.
I will also try to locate Campbell County Va Family Cemeteries Book IV 1998 so that I can verify THAT Mary is buried in the Cobb Family Cenetery.
https://www.findagrave.com/memorial/71339036/mary_cobbs